From the WizyGmail menu at the top of Gmail click on Reports (1)
Please note that you need to be in a Team account, or Invite Users (2) to your account, to be able to share the results of a Mail Merge. Find out more here.
Click on Team Reports (1) then Mail Merge (2).
All Users with the Role Manager (3) in your Team account will be able to see the results of your Mail Merge
The owner of the subscription can change the Role (1) of Users by clicking on the pencil under, Administration